28 Apr
2005
28 Apr
'05
5:01 p.m.
ISTR that when I made my own perspex plugs, before I
had real ones
(other than a "zero"), I found there was no real difference between
"short" and "intermediate" -- "short" doesn't move a
contact, "long" or
"intermediate" does.
I believe the 'intermediate' is the edge that operates the plug-inserted
contact. The plug is desiged so that the address bit contacts are
operated before the plug-detect contact, thus (hopefully) ensuring the
former are valvid before the latter opertates. This allows you to swap
plugs on a powered-up system without the risk of a drive momentarily
getting the wrong address.
-tony